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Finding the Fourth Proportional to 455.58, 628.92 and 308.58

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Solution

The fourth proportional to 455.58, 628.92 and 308.58 is: 425.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.58 : 628.92 = 308.58 : x
  2. Step 2: Convert to fraction form
    455.58/628.92 = 308.58/x
  3. Step 3: Cross multiply
    455.58x = 628.92 × 308.58
  4. Step 4: Simplify right side
    455.58x = 194,072.13
  5. Step 5: Solve for x
    x = 194,072.13/455.58
  6. Step 6: Final answer
    x = 425.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.